soc/amd/picasso: introduce and use devicetree aliases for I2C2&I2C3

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I06102f4fcc3bf9de332c71a52c632241b95cde19
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55543
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/mainboard/google/zork/variants/baseboard/devicetree_trembyle.cb b/src/mainboard/google/zork/variants/baseboard/devicetree_trembyle.cb
index 364458b2..3bf6fbc 100644
--- a/src/mainboard/google/zork/variants/baseboard/devicetree_trembyle.cb
+++ b/src/mainboard/google/zork/variants/baseboard/devicetree_trembyle.cb
@@ -428,7 +428,7 @@
 			device generic 0.1 on end
 	end
 
-	device mmio 0xfedc5000 on
+	device ref i2c_3 on
 		chip drivers/i2c/tpm
 			register "hid" = ""GOOG0005""
 			register "desc" = ""Cr50 TPM""